Melanie,

Thank you very much. I was having a real seniors moment for a while there. My code now works beautifully.

Code:
main:
    for a = 0 to 4
    gosub read_temp
    sign_c_array[a] = sign_c
    sign_f_array[a] = sign_f
    temp_c_array[a] = temp_c
    temp_f_array[a] = temp_f
    temp_k_array[a] = temp_k
    next a
    gosub display
    goto main